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Make it return an error when you use `transfer from` when you're not a secondary. Add tests as well. Fixes #310
secondary
secondary enables serving a zone retrieved from a primary server.
Syntax
secondary [zones...]
zoneszones it should be authoritative for. If empty, the zones from the configuration block are used. Note that without a remote address to get the zone from, the above is not that useful.
A working syntax would be:
secondary [zones...] {
transfer from address
[transfer to address]
}
transfer fromspecifies from which address to fetch the zone. It can be specified multiple times; if one does not work, another will be tried.transfer tocan be enabled to allow this secondary zone to be transferred again.
Examples
secondary [zones...] {
transfer from 10.0.1.1
transfer from 10.1.2.1
}